Improved grinding-mill



G. N.` ANNAN. GRINDING MILL.

No. 81,725. Patented Sept. 1, 1868.

[mW/mn UNITED] STATES rrrcn.

ATENT GEORGE N. ANNAN, OF BUFFALO, NEW YORK.

iMPROVEDGRiNDiNe-MILL.

To all whom t 'may concern:

Beit known that I, GEORGE N. ANNAN, of the city of Buffalo, county ofErie, and State of New York, have invented a certain new and usefulImprovement in Grinding-Mills; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, making part of this specification.

Figure 1 is a perspective view of my improved grinding-mill; Fig. 2, avertical crosssection; Fig. 3, a view of theY grinding-cylinder andconcave bed removed from place.

Like letters of reference indicate corresponding parts in all thefigures.

My improvement belongs to thatclass known as portable mills, and theinvention'relates principally to aniinproved mode of hanging andadjusting the concave bed nearer to or farther from thegrinding-cylinder by pressing outward upon the journals and inward uponthe body of said bed, as hereinafter set forth.

In the drawings, A indicates the casing, B the grinding-cylinder, andG'the concave bed, the cylinder and bed being situated horizon-- tallyin the casing. The concave bed is lhung by journals a a. in oblongbearings b b of the casing. These journals are at the ends of the bed,and situated about midway ot' the width,

so as to produce a balance. A gainstthe journals a a rest sliding blocksc c, dovetailed or mortised loosely into the heads D D. of the cas ing,so as to press outward againstthe journals a a. by turning screws d d,as clearly shown in Fig. 1. Screws ff and g g, respectively above andbelow, pass through the side of the casing and bear upon the fourcorners of the bed, pressing inward or in the direction opposite'toblocks c c. By this arrangement of the blocks c pressing outward againstthe journals, and the screws f g pressing inward against the corners ofthe bed, I place the'whole bed perfectly under control and render it.adjustable to any desired place, `and at the same time hold it in afixed position-v-an eect, so far as I know, neverbefore produced. Themost essen tial feature is rendering the axis or journals adjustable inand out, whereby thev opening between the` cylinder and bed is adaptedto grains of different sizes, and also to grinding of different degreesof Iineness. In connection with this outward adjustment of the journalsthe inward pressure of the screws upon the four corners is alsoessential `to prevent any rockin g action, and also to set the bed inany position desired, either` in or out, bodily, or one edge or one endto a greater degree than the other.

I am aware' that a concave bed has before been employed having journalsat the upper edge, and a single adjusting-screw pressing centrally toset the bed up to the cylinder. In such case, however, the singleset-screw allows a rocking and irregular motion, which impairs theeieiency of the machine. Such is not the equivalent of my arrangement,where the inward and outward action oppose each other, thereby holdingevery part firm. f

The cylinder and bed are provided with grinding-teeth It h, as shown. Inorder to prevent these teeth from coming in contact when set closetogether, I provide the ends of either the cylinder or the bed withplain rims i t', projecting alittle beyond the teeth, against which.the

.opposite part will strike before the teeth can engage. If desirable,these rims may be hardcned to prevent wear.-

Ribs k Icare made to project over the top of the cylinder and bed toprevent the grain from passing outside of those parts. The heads I) D ofthe casing are simplyrbolted fast, as shown iii-Fig. 1. At the top anotch is cut in each head, which fits over a lug, l, cast in the end ofthe casing. This and block c holding on journal a serve as a double lockto hold the head stationary in place, and without strain upon thescrew-bolts. This mill is intended more especially for grinding feed foranimals, in which case it is desirable to -produce only a coarsearticle. In order to remove the finer particles, I design placing themill over a box having an incline sieve vor screen beneath, which willthrow olf the coarser part, while the flue particles pass through. Thismeal thus made forms a tine material for family use, and

as it can be produced in smallquantities at will is always fresh.

I do not claim broadly an adjustable con cave bed in combination with agrinding-cylinder, for that is old; but

What I claim as my invention, andi-desire to secure by Letters Patent,is-

1. Thecombination of the blocks ce, pressing outward upon the journalsof the bed, and the In witness whereof I have hereunto signed screws ffand g g, pressing inward upon the my name in the presence oi' twosubscribingfour corners of the bed, thus opposing each witnesses.

other, the whole arranged als described, and

operating in the manner and for the nnmose GEO. X. ANNAN specified.

2. Connecting the heads D tothe ends-0f the Witnesses: case by the Iawolocks c I, in addition to the or- R. lF. OSGOOD, dinary screws, wherebythe great strain is re- ALBERT Hiuen'r.

moved from the screws, :1s herein set forth.

